2

The service to our house is buried. The transformer sits beside our meter post. The 200 AMP service main panel is 130 ft from the meter post in the house. The unattached garage and workshop are 30 meters from the post in another direction.

I want to install a 60 AMP sub panel for the workshop/garage. Can I run it from the Meter box to the workshop/garage, or do I have to run from the main panel in the house? I'm planning to run 2-2-2-4 Black Stranded AL Quad Dyke URD Cable underground in a conduit.

Can I feed two panels from the same meter box?

Any help is appreciated.

  • 1
    Is there a breaker panel at the meter? (Just asking about main breaker alone could lead to ambiguity if the panel in the house has a redundant main breaker for convenience) – Tyson Jun 20 '18 at 20:04
  • The main breaker is in a corner storage room closest to the meter post. The house is a one story ranch. – Raven Loonie Jun 20 '18 at 20:55
  • There is no breaker panel at the meter. – Raven Loonie Jun 20 '18 at 20:56
  • Tough one. The rules here are a little funny because normally, service laterals are the utility's bailiwick, which uses lighter rules, and NEC attempts to liberalize its rules in those cases. For instance you size wire based on 83% of breaker rating, so that #2Al is legal. Make sure it is AA-8000 alloy not 1350. – Harper Jun 20 '18 at 21:31
  • Appreciate the information Harper, and the suggestion regarding the alloy. – Raven Loonie Jun 20 '18 at 23:26
1

Yes you can...

Your configuration is anticipated by NEC 230.40 Exception 3:

Exception No.3: A single-family dwelling unit and its accessory structures shall be permitted to have one set of service-entrance conductors run to each from a single service drop, set of overhead service conductors, set of underground service conductors, or service lateral.

but you're making your life harder than it needs to be

Your problem, though, will be jamming that outsized URD cable down the conduit. It has one more wire in it than you need (since you haven't hit a service disconnecting means yet, you don't need to separate ground from neutral for this run, and the panel in the garage will be a main panel), and running cables through conduits is a pain in the rump as a general rule, in addition to being rather wasteful of conduit fill.

Instead, I'd suggest running a trio of #6 copper THHN/THWNs (black, black, white) through a fat conduit (2" Schedule 80 PVC is what I'd use in your shoes). This makes upgrading to a bigger service to the garage easy (compared to digging up a direct bury cable or pulling wires out of an overstuffed conduit), and also won't leave you tearing your hair out trying to get a reliable termination on AA-1350 (yes, URD is still "old tech" aluminum) wires.

Last but not least

Since you are running to a separate structure, you'll need to put in a grounding electrode system at the garage (2 rods 8' apart, with 6AWG bare copper going rod-rod-panel, always works). This is needed to make sure that a nearby lightning strike doesn't completely fry the contents of the garage.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.